Divisor is equal to zero......Help...plz

Question

Hi all.
I tried to get a tablespace and fragmentation information with blow script.
But I got an error(ORA-1476 : divisor is equal to zero)
How can I fix the script properly ?
Could anybody help me to fix the script?
Thanks in advance.
select tablespace_name,sum(obj_cnt) object_count,sum(ini_ext) init_ext,sum(nex_ex
t) next_ext,sum(byte)/1048576 bytesize,
(sum(byte)/1048576)- (sum(fbyte)/1048576) byteused,sum(fbyte)/1048576 bytefree,
sum(frags), sum(largest)/1048576 avail,
(sum(fbyte)/sum(byte))*100 free
from (select tablespace_name,0 obj_cnt,0 ini_ext,0 nex_ext, 0 byte, sum(bytes) fb
yte, count(*) frags, max(bytes) largest
from dba_free_space
group by tablespace_name
union
select tablespace_name,0, 0, 0, sum(bytes), 0, 0, 0 from dba_data_files
group by tablespace_name
union
select tablespace_name, 0, initial_extent/1024 ini_ext, next_extent/1024 nex_ext,
0,0,0,0
from dba_tablespaces
union
select tablespace_name, count(*) obj_cnt, 0, 0, 0, 0, 0, 0
from dba_segments
group by tablespace_name)
group by tablespace_name

Answer 1

The various NVL and DECODE solutions may get rid of the error, but will not get you the correct answer. By the way, you may want to look at the differences in behaviour between
(sum(fbyte)/decode(sum(byte),0,NULL))*100 free and
(sum(fbyte)/decode(sum(byte),0,1))*100 free before you use either.
Your real problem is that you have a temp tablespace using temporary files. This is the right thing to do, but, you need another union in your statement, to access dba_temp_files:
SELECT tablespace_name,SUM(obj_cnt) object_count,
       SUM(ini_ext) init_ext, SUM(nex_ext) next_ext,
       SUM(byte)/1048576 bytesize,
       (SUM(byte)/1048576)- (SUM(fbyte)/1048576) byteused,
       SUM(fbyte)/1048576 bytefree, SUM(frags), SUM(largest)/1048576 avail,
       (SUM(fbyte)/SUM(byte))*100 free
FROM (SELECT tablespace_name, 0 obj_cnt, 0 ini_ext, 0 nex_ext, 0 byte,
             SUM(bytes) fbyte, COUNT(*) frags, MAX(bytes) largest
      FROM dba_free_space
      GROUP BY tablespace_name
      UNION ALL
      SELECT tablespace_name,0, 0, 0, sum(bytes), 0, 0, 0
      FROM dba_data_files
      GROUP BY tablespace_name
      UNION ALL
      SELECT tablespace_name,0, 0, 0, sum(bytes), 0, 0, 0
FROM dba_temp_files
GROUP BY tablespace_name
      UNION ALL
      SELECT tablespace_name, 0, initial_extent/1024 ini_ext,
             next_extent/1024 nex_ext, 0,0,0,0
      FROM dba_tablespaces
      UNION ALL
      SELECT tablespace_name, COUNT(*) obj_cnt, 0, 0, 0, 0, 0, 0
      FROM dba_segments
      GROUP BY tablespace_name)
GROUP BY tablespace_nameYou should also use UNION ALL instead of UNION, because UNION implies a sort distinct, whil union all does not. The sort is unneccessary, and the distinct may cause you to lose rows.
TTFn
John